Clinical Trials in California
California has 1,246 clinical trials currently recruiting participants, ranking #1 among all states. The most-studied condition is Schizophrenia with 18 active trials.
1,246
Total Trials
1,246
Recruiting
#1
National Rank
20
Conditions
Trials by Phase
445
Not Applicable
114
Phase 1 / Phase 2
33
Phase 2 / Phase 3
12
Early Phase 1
120
Phase 1
231
Phase 2
241
Phase 3
50
Phase 4
Top Conditions in California
| # | Condition | Trials |
|---|---|---|
| 1 | Schizophrenia | 18 |
| 2 | Ulcerative Colitis | 16 |
| 3 | Pancreatic Cancer | 15 |
| 4 | Autism Spectrum Disorder | 15 |
| 5 | Multiple Sclerosis | 15 |
| 6 | Colorectal Cancer | 15 |
| 7 | Amyotrophic Lateral Sclerosis | 14 |
| 8 | Multiple Myeloma | 14 |
| 9 | Ovarian Cancer | 14 |
| 10 | Sickle Cell Disease | 13 |
| 11 | Obesity | 13 |
| 12 | Obsessive-Compulsive Disorder | 13 |
| 13 | Depression | 13 |
| 14 | Myasthenia Gravis | 13 |
| 15 | Lung Cancer | 12 |
| 16 | Esophageal Cancer | 12 |
| 17 | Prostate Cancer | 12 |
| 18 | Bladder Cancer | 12 |
| 19 | Psoriatic Arthritis | 11 |
| 20 | Rheumatoid Arthritis | 11 |
Top Sponsors in California
Cities With Most Trials in California
| # | City | Trials |
|---|---|---|
| 1 | Los Angeles | 564 |
| 2 | San Francisco | 295 |
| 3 | San Diego | 181 |
| 4 | Orange | 155 |
| 5 | Sacramento | 145 |
| 6 | Palo Alto | 137 |
| 7 | La Jolla | 121 |
| 8 | Duarte | 92 |
| 9 | Stanford | 80 |
| 10 | Irvine | 73 |
| 11 | Long Beach | 67 |
| 12 | Newport Beach | 56 |
| 13 | Torrance | 45 |
| 14 | Fullerton | 45 |
| 15 | Beverly Hills | 43 |
Important: This information is for research purposes only. Always talk to your doctor about whether a clinical trial is right for you.
Frequently Asked Questions
California currently has 1,246 clinical trials actively recruiting participants, making it #1 nationally by total trial count.
The most-studied conditions in California are Schizophrenia (18 trials), Ulcerative Colitis (16 trials), Pancreatic Cancer (15 trials).
Browse the conditions listed on this page to find trials recruiting in California. Each condition page shows trial details, eligibility criteria in plain English, and contact information. Always talk to your doctor about whether a trial is right for you.
Trial counts reflect currently recruiting studies listed on ClinicalTrials.gov with locations in this state.